[TriLUG] Need help finding bottleneck

[Jeremy Portzer]

I don't think the issue is DNS or linux server performance, exactly.  It's 
probably the router doing odd things with the packets.

Roy - try pinging your server's external IP address from within the home 
network.  See what kind of response time and packet loss you get.

In my situation, with the exact same symptoms (see previous post), I often 
get 40-50% packet loss.  When downloading medium-sized files (e.g. images 
from the gallery), I typically get 2-3 Kbytes/sec. - worse than dialup 
speed.

Even if the packets are being sent to the cable modem, and bridged out to 
the physical cable, and then back into the router, there is no excuse for 
this kind of slowness, which is why I need a new router :-)

--Jeremy

On Sun, 21 Jan 2007, Jason Tower wrote:

> there's an old auto repair joke: when troubleshooting a poorly running 
> engine there are three main culprits: air, fuel, and ignition.  and it's 
> *always* the ignition :)
> 
> troubleshooting a poorly performing linux server isn't much different.  you 
>   can look at ram, cpu, disks, and so on, but it's *always* dns.
> 
> jason
> 
> sholton wrote:
> > Roy Vestal wrote:
> >> Hey guys...need some troubleshooting help...
> >>
> >> Symptom:
> >> when I load my webpage from home, or my gallery, it takes literally 
> >> minutes to load. http://website/gallery for example can take upto 5 
> >> min to load.
> >>
> >> When I'm at work, it loads great, within just a few seconds.
> > 
> > 
> > I've seen a similar case, long ago (details fuzzy) where the problem was 
> >  a server demanding a reverse-lookup on the requesting client which 
> > wasn't available. (maybe httpd trying to log full hostnames but being 
> > frustrated by timeouts on DNS hosts which weren't there.)
> > 
> 

-- 
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| Jeremy Portzer        jeremyp at pobox.com      trilug.org/~jeremy     |
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